U Page 4
Digital controller RK 4004
In a control structure for proportional actuators the web or tool actual
position value is compared with the required set position value and, in
the event of a deviation, it is transmitted to a P position controller as a
control difference. The resultant set speed value is compared with the
actual speed value and transmitted to the PI speed controller. The lat-
ter emits a pulse width-modulated signal at the output stage.
The following are available as proportional actuators:
DRS pivoting frame, VWS turning rod, SRS steering roller, WSS win-
ding station, SVS push roller SVS and VSS positioning and follow-up
controller.
1.4 Control structure with
constant controlling for
proportional actuators
Control structure legend
1 Operating mode
2 Actuator position controller
3 Max. variable actuating speed in manual
4 Speed controller
5 Variable current controller
6 Power output stage
7 Gearing with spindle
8 Right end position
9 Center position
10 Left end position
11 Right offset
12 Left offset
13 Actual position memory
14 Actual speed value recording
15 Counter
16 Incremental encoder
17 Web position controller
18 Max. variable actuating speed in automatic
19 Memory command at stop
20 Right edge sensor
21 Left edge sensor
22 Sensor selection (right web edge, left web edge, web center)
23 Web offset
24 Oscillation generator
25 Current controller
